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United States swelters under dangerous holiday heatwave

PUBLISHED Jul 3, 2026, 8:04 AM ET

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United States swelters under dangerous holiday heatwave

UNITED STATES – A prolonged and dangerous heatwave is gripping the central and eastern parts of the country ahead of the July Fourth holiday, with the National Weather Service warning of extreme, record-challenging temperatures and oppressive humidity. Under a persistent heat dome, heat index values between 100°F and 115°F are forecast across the Midwest, Ohio Valley and East Coast through at least Saturday, prompting widespread advisories for “Major to Extreme HeatRisk.” Forecasters say numerous daily, monthly and potentially all-time temperature records are likely to be challenged or broken as the hot, stagnant air mass lingers over heavily populated regions and disrupts outdoor plans for millions of Americans. NEW YORK – The heatwave is hitting the Northeast particularly hard, with temperatures in New York City’s Central Park reaching 100°F on the afternoon of July 2, the first triple-digit reading there since July 2012. Local officials, including Mayor Zohran Mamdani, urged residents to take immediate precautions, drink more water than usual and check on vulnerable neighbors, while the city opened cooling centers and deployed emergency resources. The National Weather Service warned that dangerous heat and humidity will persist, with heat index values possibly reaching 115°F, and cautioned that severe thunderstorms could bring damaging winds, heavy rainfall and localized flash flooding. Public health officials noted that extreme heat is the leading cause of weather-related deaths in the United States and stressed that the combination of very hot days and warm nights significantly raises the risk of heat exhaustion and heat stroke.

By Lauren Mitchell | JQJO News

Timeline of Events

  • July 2012 Central Park last triple-digit temperature
  • Recent days Heat dome builds over central states
  • July 2 Central Park hits 100 degrees
  • July 2 NWS issues widespread heat warnings
  • This week Heat index reaches up to 115
  • This week New York activates public cooling centers
  • Through Saturday Record temperatures forecast to persist
  • Coming days Thunderstorms threaten flooding and outages

News Intelligence

  • This heatwave isn't just uncomfortable, it's dangerous. Extreme heat is the top weather-related killer in the US. It's especially risky for older adults, kids, and people with health issues. Check on your neighbors and stay hydrated.

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